Portable paving plant



Jan. 18, 1938. G. J. KuHR'rs, JR 2,105,008

PORTABLE PAVING PLANT y Filed Dec. 24, 1954 s sheets-sheet 1 A TTORNEY Jan. 18, 1938. G. .J. KUHRTS, JR

P-ORTABLE PAVING PLANT Filed Deo. .24, 1934 3 Sheets-Sheet 2 INVENTOR. G50/F65 JKM/@75. J/a

W. N m T T A `Ian. 18, 1938. G, 1 KUHRTS' JR 2,106,008

PORTABLE PAVING PLANT Filed Dec. 24, 1934 5 Sheets-Sheet 5 INVEN TOR. G50/Q65 JKU/#975, Je

ATToRNEY Patented Jan. 18, l1938 PATENT OFFICE PORTABLE PAVING PLANT George J. Kuhrts,'Jr., Los Angeles, Calif.,

to Standard Steel Works, Los Angeles,

assignor Calif.,

a corporation of California Application December 24, 1934, Serial No, '158,954

15 Claims.

My present invention relates to improvements in portable paving plants, particularly as disclosed in my copending application for a similar structure, Serial No. 428,428.

5 The objects of my improvements are:

First, to provide a portable paving plant which may be easily and economically conveyed from place to place in a dismantled or knocked-down condition and quickly `and easily assembled or put 1o up with the least amount of eiort and equipment;

Second, to provide a paving machine having a multiplicity of aggregate-containing bins and a novel, simple and economical overow means in 15 connection with some or all of said bins, for diverting the overflow therefrom;

Third, to provide a machine of this class having very simple and economical means for diverting some of the aggregatefinto another bin or 20 channel; l

Fourth, to provide a paving machine in which the aggregate to be screened is discharged on to a receiving and distributing plate and therefrom on to the screen, thus more evenly distributing the 25 aggregate over the screen and protectingthe screen against rapid or unusual wear;

Fifth, to provide as a whole a novelly constructed paving plant and one which is simple and economical of construction and operation, and which will not readily get out of order.

With the above objects in view, I have devised a paving plant having certain novel features'of construction, as will be hereinafter described in detail and particularly set forth in the appended claims, reference being had to the accompanying drawings which form a part of this application, and to like characters of reference designating similar parts on the several views of the drawings, in which: f

Fig. 1 is an elevational view taken from the operators side thereof, showing the relative position of a dump truck for receiving a'batch of the mixed material;

Fig. 2 is an end elevational view thereof with 45 parts broken away to facilitate the illustration; Fig. 3 is a side elevational view of my plant in the process of assembling;

Fig. 4 is an enlarged side elevational View of the storage bins, screens, oversize means, overow 50 means, and associated parts;

Fig. 5 is a sectional elevational view thereof taken through 5-5 of Fig. 4; and,

Fig. 6 is a sectional view thereof in plan taken at 6--6 of Fig. 4.

55 My paving plant, as illustrated in the drawings,

(ci. sii-41) consists of a normally lower paving plant unit A and a normally upper paving plant unit B, each of which is adapted to be conveyed separately from place to place, and, when set up, are superimposed for cooperative use.

the unit may be easily drawn over the road bed.

When in operation the wheels 2 of the unit A are supported on pedestals Il, there being provided one for each pair of front and rear wheels, the pedestals extending transversely of the machine. The unit A is drawn intoplace on the pedestals by a-skid I2 which comprises a pair of long channels laterally spaced but rigidly secured together,forming tracks extending on an incline from the ground to the iirst pedestal. The space between the pedestal is bridged by a suitable truss track i3, which is removed when the unit A is in.

. place.

The frame I is arched between the pairs of front and rear wheels, as indicated by la, to provide ample clearance space for the passage of a dump truck transversely with respect to the unit A. l

Such construction of the unit A.. provides a. relatively low structure which may be readily conveyed from place to place.

On the unit A is a concrete or asphalt mixer 2| having its discharge immediately at the top of the arch for readily discharging the contents of the mixer into the body of the truck below. Above the mixer is located the weigh-hopper 22 which is carried for convenience, and during transportation, by the frame I, but attached to or suspended `from a weighing apparatus 23 carried by the frame 21 of the upper unit B.

The frame I is provided with upwardly directed channels 24 at the opposite sides of the upper end, forming spaced tracks extending longitudinally with respect to the frame and its supporting wheels.

The frame 21, ofthe unit B, is also supported on vehicle wheels 28. These Wheels are mounted on axles 29 having vehicle springs 30 upon which the frame 21 is mounted. Such mounting of the unit B alsoprovides a structure which may be easily drawn over the road bed.

It will be here noted that the wheels of both 4 units are preferably so mounted that the units may be readily directed around curves.

In order to mount the unit B on the unit A, the skid |2 is mounted to extend diagonally from the ground to the channels 24, as shown by dotted lines in Fig. 3. The unit B is then run up the inclined runway to the top of the unit A and anchored in place as shown in Figs. 1 and 2.

On the frame 21 is mounted a multiple bin 32 which is divided transversely by walls 33 into a plurality of separate bins, 32a, 32h, 32a, and 32d, each of which is adapted to contain different size aggregate. The lower ends of the bins are provided with gates, which may be either manually or automatically controlled for discharging the aggregate directly into the weigh hopper.` At the upper end of the frame 21 is mounted a screen apparatus 31. 'I'his screen is enclosed in a frame 31a. resiliently supported on diagonal leaf springs 38 mounted on the frame 3|. The screen frame is horizontally reciprocated by an eccentric 39. In the screen frame are different-mesh horizontal-screens 40, 4|, 42, and 43. 'I'he screens 40 and 4| are in the same plane at the upper po ion of the frame, the former being of ilner mesh than the latter. Spaced below these screens are respectively the screens 42 and 43, the former being of screen 40, the fines dropping to the screen 42.

Theiinest aggregate passes through the screen 42 into the bin 32a, while that which does not pass `therethrough is directed to the far end of the screen 42, from which it drops into the bin 32h. A plate 41 is directed downwardly from and between the screen 40 andV 4| and extends adjacent the top of the wall 33 dividing the bins 32h and 32e. The ilner aggregate delivered to the screen 4| drops to the screen 43, the ner dropping through the screen into the bin 32c and the coarser passing to the end of the screen and dropping into the bin 32d.

At the far end of the screen is a chute 48 for receiving the oversize aggregate passing to and dropping from the far endof the coarsest screen 4|, that is, aggregate which does not pass through the screen. This oversize aggregate is diverted or directed to the side of the machine. i

To reduce to a minimum, the necessary Aattention to be given to the eillcient operation of the plant, I have provided an efllcient and economical overflow means which consists of a long large pipe and a plurality of short pipes 52, 53, 54, and 55. The pipe 5| extends from the middle portion of the upper end of the bin 32a diagonally through all bins to the outer side and lower end of the opposite end bin 32d. The pipes 52, 53, and 54 extend respectively from the middle portions of the upper ends of the bins 32b, 32e, and 32d diagonally backwardly and are connected at their lower ends to the main pipe 5|. 'Ihese pipes are placed at an angle so as to ease the discharge of the overflow aggregate into these overflow pipes. The upper ends of these pipes are preferably provided with hoods or guards 56, or similar means, to prevent screened aggregate falling thereinto directly from the screens.

The pipe 55 connects the lower end of the oversize aggregate chute 48 with the overflow pipe 5| so that all discarded aggregate is diverted in one direction. In this pipe 55 is a manually operated 4 gate 51 which may be closed whereby the oversize 1. In a paving plant, a plurality ofadjacently positioned aggregate bins, means for delivering different size aggregate to the separte bins, and an overflow pipe having a plurality of branches, each branch being open at its upper end and extending ,to the upper portion of a separate bin.

2. In a paving plant, a plurality of adJacently positioned aggregate bins, means for delivering different size aggregate to the separate bins, and an overflow pipe open at the upper end and extending from the upper portion of one end bin diagonally downwardly through the other bins and discharging at the outer side of the other end bin, and branch overflow pipes open at their upper ends and extending from the upper portions of the other bins, positioned to one side of the ilrst end bin, downwardly in the opposite angular direction and each branch overflow pipe discharging into the ilrst overflow pipe.

3. In a paving plant, a plurality of adjacently positioned aggregate bins, a multiple screen for delivering different size screened aggregate to the separate bins, an oversize aggregate chute positioned adjacent a coarse aggregate bin and at one end of` the screen for receiving aggregate not passing through the screen, an overflow pipe having a plurality of branches, each branch being open at its upper end and extending to the upperl portion of a separate bin, said chute connecting with said pipe, and a gate for said chute, the overflow of said chute, when said gate is closed, discharging into said coarse aggregate bin.

4. In a paving plant, a plurality of adjacently positioned/aggregate bins, a multiple screen for delivering different size screened aggregate to the separate bins, an oversize aggregate chute positioned adjacent a coarse aggregate bin and at one end of the screen for receiving aggregate not passing through the screen, an overilow pipe open at the upper end and extending from the upper portion of one end bin diagonally downwardly through the other bins and discharging at the outer side of the other end bin, and branch overow pipes open at their upper ends and extending from the upper portions of the other bins, positioned to one side of the first end bin, and each f branch overflow pipe and said chute discharging into the ilrst overflow pipe, and a gate for said chute, the `overilow of said chute, when said gate is closed, discharging into said coarse aggregate bin.

5. Ina pavingplant, a plurality of aggregate i bins, means for delivering dierent size aggrepositioned aggregate bins, a multiple screen for receiving aggregate and delivering portions theremik 8. In a paving plant, an aggregate bin, meansA for delivering aggregate to the upper portion thereof, and an overilow pipe open at one end and extending downwardly therefrom and to one side of the lower portion of the bin.

9. In a portable paving plant, a paving plant unit of a height to allow normally freepassage over conventional highways, said unit having an' arch at the lower portion, said arch being of less than the normal height to allow passage of a con,- ventional dump truck therethrough, and a foundation structure for supporting the opposite sides of the arch at a height suiiicient to allow the free'passage of said truck under said arch.

10. In a portable paving plant, a paving plant unit having an arch at the lower'portion, said arch being of less than the normal height to allow free passage of a dump truck therethrough, a plurality of pedestals, a temporary bridge for spanning the pedestals, and atrack skid for running the unit from the ground upon said pedestals and over said bridge, the height of said arch above the ground, when said unit is raised on said pedestals, being suicient to allow free passage of said truck.

11. In a portable paving plant, a paving plant unit of a height to allow normally freel passage over conventional highways, transporting wheels for the unit, said unit having Van arch at the lower portion between said wheels, said arch being of less than the normal height to allow free passage of a dump truck therethrough, a plurality of pedestals, a temporary bridge for spanning the pedestals, and a track skid for running the 'unit from the ground upon said pedestals and estals, being suflicient to allow free passage of Said truck.

12. In a portable paving plant, a pair Aoi.' separate cooperating paving plant units adapted to be superposed one above the other for cooperative use, the height of each unit being such as to allow normally free passage of each unit separately over conventional highways, the normally lower unit having an arch at the lower portion, said arch being of less than the normal height to allow free passage of a dump truck therethrough, a plurality of pedestals, a temporary bridge for spanning the pedestals, and a track skid for running the lower unit from the ground upon said pedestals and over said bridge, the

height of said arch above the ground, when said lportable paving plant unit'having an arch at lthe lower. portion, said arch being of less than the normal height to allow free passage of a dump truck therethrough, said method consisting in spanning the top of the pedestals with a temporary bridge, running the unit'over an inclined track skid upon the nearest pedestaland over saidbridge to and upon the other pedestal, then removing the bridge to provide an arched passageway between the pedestals and under said arch of sufdcient height to allow free passage of said truck.

14. In a paving plant, an aggregate bin, a screen for delivering aggregate vto said bin, an oversize aggregate chute positioned adjacent said bin and at one end of the screen for receiving aggregate not passing through the screen, an overflow pipe extending from the upper portion of said bin, said chute connecting with said pipe, and a gate for said chute, the overflow from said chute, when said gate is closed, discharging into said bin.A

-upper portion oi the bin, and a guard for the upper open end of the pipe to deflect to the side of the pipe aggregate falling from the screen. GEORGE J. KUI-IRTS, Jn.

usl 

